Trussed structure



mm 10,15 Y 60,979

G. H. DAWSQN ET AL TRUSSED S TRUCTURE Filed July 17, 192 3 SheetvSheet 1 G. H. DAWSON ET AL TRUSSED STRUCTURE Filed July 17, 1924 5 Sheets-Sheet 2 1,560,979 G. H. DAWSCN ET AL I TRUSSED STRUCTURE Filed July 17, 1924 s Sheets-Sheet 5 Nov. 10, 1925- Patented Nov. 1925. v r

UNITED STATES ATENToFFIc esonsn Elves Dawson AND auzax'rmu. FIELD rnnasn-, or :eos'ron, MASSA- onusn'r'rs. a

TRUSSED STRUCTURE.

Application filed J'uly 17, 1924. Serial No. 726,489.

To all wlwm it may concern:

Be it known that we, GEORGE HIVES DAW- SON and HURXTHAL FIELD FREASE, citizens of the United States, residing at Boston, in

the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Trussed Structures, of which the following is a specification. v

The invention relates to trussed structures of the type set forth in our'joint aplication for United States Letters Patent, gerial No. 676,897, filed November 26, 1923, comprising spaced chord members and connecting web members joined together and formedfrom continuous strip, bar, or rod material. i

The present invention relates more particularlyto continuous strip trussed structures having chord members of different crosssection than the web members; the difference in cross-section being achieved by varying the geometric outlines of the continuous strip, bar, or rod material from which the structures are made.

The objectsof the present invention are to provide trussed structures made from continuous strip, bar, or rod material having varying geometric outlines; the types of such structures including among others, trussed I structures and T structures; internally trussed tubing; and trussed structures having channel or tubular chord members.

Several practical means of attaining these objects are illustrated by the accompanying drawings, in Which- Figure 1 is an isometric view of a length of continuous strip trussed I structure;

Fig. 2, an isometricview of a length of the blank for the same;

Fig. 3, an isometric view of a length of the blank partially formed to make the trussed I structure;

Fig. 4, an oblique perspective view of a length of continuous strip trussed structure having channel chord members;

Fig. 5, an oblique perspective view of a length of the blank for the same with the channel chord members already formed;

Fi 6, an oblique perspective view of a lengt of the blank for a continuous strip.

trussed I structure having chord members comprising plural, overlapped strips;

Fig. 7, an oblique perspective view of the same partially formed to make the I struc ture; I

Fig; 8, an oblique perspective View of a lengt of the continuous strip trussed I structure having chord members comprising plural, overlapped strips;

Fig. 9, an oblique perspective view of a length of the continuous strip trussed structure in' the form of'an internally trussed rectangular tube, a portion of the tube showing in cross-section at intersecting planes IX-IX and X-X;

Fig. 10, an oblique perspective view of a length of the blank for the same; and

Fig. 11, a. length of continuous strip trussed structure having rectangular tube chord members, showing some of the chord members before forming.

For the purposes of clearness of illustration no fastening means are shown. In the structures illustrated the fastening means are presumed to be some form of welding,

spot, seam, butt, are, or acetylene, which will be designated in connection with the detailed description of each type.

It is obvious, however, that rivets, or any other desired mechanical fastening means may be used in place of the presumed welds for joining together the members of the trussed structures.

Moreover, the material used may be unperforated as shown, or may be perforated,

or may be made of expanded metal of any desired type.

Similar characters of reference indicate similar parts throughout the drawings.

The various improved trussed structures S S S, S, and S shown, respectively, in Figs. 1, 4, 8, 9, and 11, comprise, respectively, spaced chord members of various cross-sections C C C C and C, and connecting web members W "W 7 W, and W respectively, alternating with, con

tinuous with, and connected to 'the'chord j connectlng or fastenlng members. The means, not shown, used at the junctions of the chord and Web members are presumed to be the forms of weld presently to be described, although other fastening means inay be used. It must be clearly understood, however, that some formof fastening means must be used to join the chord members and web members at the junctions of the various structures. I

The I structure S is made from the strip blank S", which is shown partially formed as S, and comprises chord members C of one cross-section, alternating and cont1nu.

ous with web members W of another crosssection; the alternating and continuous chord and web members being bent at their lines of intersection II, as shown partially bent in t to form opposing junction angles A WVhere required, slits k extending the web members into the chord members, permit the bending of the junction angles.

To make the structure S the blank S as shown has been cut from a strip of material having. a uniform thickness or depth 03 but the strip material may have a varying thickness; so that the chord members C may have a different thickness than the web members l In the blank S as shown the chord members and the web members have rectangular outlines, but the outlines might be trapezoidal.

As shown, however, the chord members C and the web members W have the same depth (F; but the chord members have a breadth b greater than the breadth 5 of the web members. The length I of the chord members C and the length 1 of the web members 1V may have any desired ratio to each other. Likewise the ratio of b to 6 may be different than that illustrated where b is greater than 6 However, as may readily be seen from the drawings, the differences in the structures 8, S S S and S, are primarily-determined by the respective differences between the similar dimensions al (Z (Z d" and (i Z), 6 b b and b b b b b and 6 I 1 I I, and I 1 I 1 I and I and la, k I6 and 72 of the chord members, C C C C, and C and the web members W W W and W of the structures.

In the structure S the length of the slits le permits the overlapping of the opposing and abutting chord members C Equal legs [L3 have been bent as shown from the material in the blank S to form the channel chord members C The structure S differs primarily from S in the relative proportions of the dimensions of the chord and web members. The length of the slits k is sufficient to permit the opposing chord members to overlap each other to form the structure illustrated. The

material in the chord members might have been bent to form channel chord members.

Likewise the internally trussed tubular structure S differs primarily from the I structure S in the relative dimensions of the chord and web members. The lengths of the legs k permit the forming of the closed tube upon bending the material in the chord members as shown.

Finally the structure S is provided with its tube chord-members C as shown by forming the material of the blank chord members.

The structure S is adapted to butt or arc welding as a fastening means at the junction angles A The structures S and S are obviously adapted to spot welding as a fastening means for the overlapped chord members. The structures S and S are adapted to are and seam welding at the junctions and the seams.

The feature of overlapping chord members shown in structures S and S might be applied to structures S and S.

The essence of the invention lies in the provision for any desired variations in form or area between the chord and web members of continuous material trussed structures by suitably fixing the geometric outline of the blank stock and performing any desired forming operations to the chord or Web members.

lVe claim:

1. A trussed structure formed from a single continuous strip, including chord members and web members, there being junction angles between the chord and web members and means fastening the chord and web members to each other at the junction angles, some of the chord members having a different cross-sectional area than the web members.

2. A trussed structure formed from a single continuous strip, including chord members and web members, there being junction angles between the chord and web members and means fastening the chord and web members to each other at the junction angles, some of the chord members being of different formed cross-sectional area than the web members.

3. A trussed structure formed from a single continuous strip including chord members and web members, there being junction angles between the chord and web members and means fastening the chord and web members to each other at the junction angles, some of the chord members having a different cross-sectional area than the web members, and overlapping each other at the junction angles.

4. trussed structure formed from a single continuous strip, including chord members and web members, therev being junction angles between the cord and Web members and means fastening the chord and Web members to each other'at the junction angles, some of the chord members 5 being formed channels.

'5. A trussed structure formed from a single continuous strip, including chord members and web members, there being junction angles between the chord and Web members and means fastening the chord and 1 Web members to each other at the junction angles, some of the chord members being formed angles. 

